The accommodation at UnionSPACE was brilliant and absolutely perfect for my trip.
One thing to know is that the beds are VERY firm, and the pillow very soft... which I like, it may not be to everyone's comfort though.
The capsules as plenty big enough to sleep in (I am 6ft), secured by a padlock, and there is a luggage area to keep your general clothes bag in.
There are 3 shower and toilet units, which was plenty during my stay and they were clean and worked well.
Use of the co-working space is a great bonus and they have good fast internet, so you can stay connected.
The kitchen area is minimal - there is a fridge and a microwave, and plenty of drinking water (which is very important)
On the balcony is the washing up table and the washing machine, which is very good, if a little complex to use...
It is located close to the BTS train, so you can very quickly get into the middle of Bangkok (about 30 mins,including 8 min walk to the station for 40 baht USD 1.15, 1 GBP)
Back again!